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Proceedings Paper

MAXI: all-sky observation from the International Space Station
Author(s): Tatehiro Mihara; Mutsumi Sugizaki; Masaru Matsuoka; Hiroshi Tomida; Shiro Ueno; Hitoshi Negoro; Atsumasa Yoshida; Hiroshi Tsunemi; Motoki Nakajima; Yoshihiro Ueda; Makoto Yamauchi
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Paper Abstract

Monitor of All-sky X-ray Image (MAXI) is mounted on the International Space Station (ISS). Since 2009 it has been scanning the whole sky in every 92 minutes with ISS rotation. Due to high particle background at high latitude regions the carbon anodes of three GSC cameras were broken. We limit the GSC operation to low-latitude region around equator. GSC is suffering a double high background from Gamma-ray altimeter of Soyuz spacecraft. MAXI issued the 37-month catalog with 500 sources above ~0.6 mCrab in 4-10 keV. MAXI issued 133 to Astronomers Telegram and 44 to Gammaray burst Coordinated Network so far. One GSC camera had a small gas leak by a micrometeorite. Since 2013 June, the 1.4 atm Xe pressure went down to 0.6 atm in 2014 May 23. By gradually reducing the high voltage we keep using the proportional counter. SSC with X-ray CCD has detected diffuse soft X-rays in the all-sky, such as Cygnus super bubble and north polar spur, as well as it found a fast soft X-ray nova MAXI J0158-744. Although we operate CCD with charge-injection, the energy resolution is degrading. In the 4.5 years of operation MAXI discovered 6 of 12 new black holes. The long-term behaviors of these sources can be classified into two types of the outbursts, 3 Fast Rise Exponential Decay (FRED) and 3 Fast Rise and Flat Top (FRFT). The cause of types is still unknown.

Paper Details

Date Published: 24 July 2014
PDF: 6 pages
Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 91441O (24 July 2014); doi: 10.1117/12.2055792
Show Author Affiliations
Tatehiro Mihara, RIKEN (Japan)
Mutsumi Sugizaki, RIKEN (Japan)
Masaru Matsuoka, RIKEN (Japan)
Hiroshi Tomida, Japan Aerospace Exploration Agency (Japan)
Shiro Ueno, Japan Aerospace Exploration Agency (Japan)
Hitoshi Negoro, Nihon Univ. (Japan)
Atsumasa Yoshida, Aoyama Gakuin Univ. (Japan)
Hiroshi Tsunemi, Osaka Univ. (Japan)
Motoki Nakajima, Nihon Univ. (Japan)
Yoshihiro Ueda, Kyoto Univ. (Japan)
Makoto Yamauchi, Univ. of Miyazaki (Japan)

Published in SPIE Proceedings Vol. 9144:
Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray
Tadayuki Takahashi; Jan-Willem A. den Herder; Mark Bautz, Editor(s)

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